class_docstr: MNIST Dataset.
class_docstr_tok: ["MNIST","Dataset","."]
code: def __len__(self):
      return len(self.images)
  
file_path: cleverhans/tutorials/torch/datasets.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import array
  import gzip
  import os
  from os import path
  import struct
  from six.moves.urllib.request import urlretrieve
  import numpy
  import torch
label_desc: Use image node_id 3 for calling the MNISTDataset obj's underlying member method code with example usage: obj.__len__() and returns: len